#include <stdio.h>
#include "lib_copy.h"
#define BLKSIZE 4096

FILE *fp, *gp;
char buf[4096];

int lib_copy(int argc, char *argv[]){
    int n, total = 0;
    if(argc < 3) exit(1);
    //check for same file
    fp = fopen(argv[1], "r");
    if(fp == NULL) exit(2);
    gp = fopen(argv[2], "w");
    if(gp == NULL) exit(3);

    while(n =fread(buf, 1, BLKSIZE, fp)){
        fwrite(buf, 1, n, gp);
        total += n;
    }
    printf("total = %d\n", total);
    fclose(fp);
    fclose(gp);
}